package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.http.impl.client.HttpClients;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {


    //微信接口地址
    private static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    UserMapper userMapper;

    @Autowired
    private WeChatProperties properties;

    /**
     * 微信登陆
     * @param userLoginDTO
     * @return
     */
    @Override
    public User login(UserLoginDTO userLoginDTO) {
        //调用微信接口服务，获得当前微信用胡的openid
        String openId = getOpenId(userLoginDTO.getCode());
        //判断openid是否为空，如果为空则表示登陆失败，提示业务异常
        if(openId == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //判断当前用户是否为新用户
        User user = userMapper.getByUserId(openId);

        //是新用户，自动完成注册
        if( user == null){
            user = User.builder()
                    .openid(openId)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.save(user);
        }
        //返回用户对象
        return user;
    }

    /**
     * 调用接口服务来获取user对应的openid
     * @param code
     * @return
     */
    private String getOpenId(String code){
        //调用微信接口服务，获得当前微信用胡的openid
        Map<String, String> wxMap = new HashMap<>();
        wxMap.put("appid", properties.getAppid());
        wxMap.put("secret", properties.getSecret());
        wxMap.put("js_code", code);
        wxMap.put("grant_type", "authorization_code");
        String res = HttpClientUtil.doGet(WX_LOGIN, wxMap);
        JSONObject jsonObject = JSON.parseObject(res);
        return jsonObject.getString("openid");
    }
}
